Which animals do farmers use as natural weed-killers?

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Farmers frequently use Geese to eliminate weeds and other plant-killing vegetation. Most of what they consume is the plants in pastures. They also are valued for their feathers to make warm winter coats.
JULIAN STRATENSCHULTE/DPA/AFP via Getty Images
JULIAN STRATENSCHULTE/DPA/AFP via Getty Images
Which animals do farmers use as natural weed-killers?
- Swans
- Ducks
- Geese
- Peacocks
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